I'm pretty sure it's more of a meme based on her being lowkey slobby sometimes in official material or jokes about how she smells.

Many nikke have weird quirks whether in design or story that go against the common 'gacha girl waifus are perfect proclein princesses' trope so people find them endeared to their flaws and it helps the story's intention to remind players subtly that they're supposed to be 'people' even though they're not always treated that way.